One problem related to radiator has been reported for the 2010 Mazda MAZDA3. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Mazda MAZDA3 based on all problems reported for the 2010 MAZDA3.
I am the original owner of this vehicle, purchased brand new. In January 2012 the heater when turning on made a loud clicking sound for approx. 20 to 30 seconds, each time. Upon research on the internet, local mechanics, I found out the heater blend door actuator is the problem. I was going to replace it, but upon further investigation I found that this heater assembly is not only used by Mazda, Nissan, Toyota, chevy, Ford, and Lexus. This heater is known to have this design error. I then decided to have the Mazda dealer change it for $130. 00. The dealer then told me the whole assembly needed changing for $250. 00 plus labor. This assembly was known for this. Also the dealer had unplugged the heater blend door actuator because this unit is known to start a fire in the vehicle. This made me extremely nervous. I consider this to be an unsafe vehicle.